package demo1;

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Text {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str1 = in.nextLine();
            String str2 = in.nextLine();
            str1 = str1.toUpperCase();
            str2 = str2.toUpperCase();
            Set<Character> set1 = new HashSet<>();
            Set<Character> set2 = new HashSet<>();
            for (int i = 0; i < str2.length(); i++) {
                set1.add(str2.charAt(i));
            }
            for (int i = 0; i < str1.length(); i++) {
                char ch = str1.charAt(i);
                if(!set1.contains(ch) && !set2.contains(ch)) {
                    System.out.print(ch);
                    set2.add(ch);
                }
            }
        }
    }
}
